Soft PVC (polyvinyl chloride) material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a soft PVC (polyvinyl chloride) material as well as a preparation method and application thereof. The invention relates to a soft PVC (polyvinyl chloride) material, which comprises the following components in percentage by mass: 40.0-60.0% of PVC resin; 25.0% to 40.0% of a plasticizer; 5.0% to 15.0% of alkali-free glass fiber; 1.5% to 5.0% of a rat-proof agent; 2.0%-5.0% of a stabilizer; and 0.5%-1.5% of a lubricant.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a soft PVC material and a preparation method and application thereof. Background Art

[0002] In many fields such as agricultural production, warehousing and logistics, building structures, and emerging energy storage and electric vehicles, rodent damage has always been a major problem that plagues production, life and safety. Rodents, with their sharp teeth and powerful gnawing ability, cause serious damage to all kinds of materials. This damage not only causes huge economic losses, such as reduced grain production, equipment damage, and damage to building structures, but may also cause more serious safety accidents, such as fires and explosions caused by bitten wires and cables, and thermal runaway caused by damage to energy storage facilities. Therefore, the development of effective rodent-proof materials is of extremely important practical significance.

[0003] Traditional rodent control methods mainly rely on chemical agents, such as the use of various types of rodenticides. However, this type of method has many inherent disadvantages. First, the use of chemical agents inevitably brings about environmental pollution problems. The residual toxic substances will cause harm to the soil, water sources and non-target organisms (such as birds, cats, etc.), destroying the ecological balance. Secondly, the long-term use of rodenticides will cause rodents to develop drug resistance, reducing the prevention and control effect. In addition, the toxicity of chemical agents also poses a potential threat to human health.

[0004] In order to overcome the limitations of chemical rodent control, researchers have developed various physical rodent control methods, such as metal barriers and ultrasonic rodent repellents. However, these methods are either costly and limited in scope, or unstable and susceptible to environmental interference. In recent years, the development of materials science has provided new ideas for rodent control technology, that is, by modifying the material to make it rodent-proof.

[0005] The existing research on rodent-proof materials mainly focuses on the following aspects: First, by adding substances with special smells or tastes, such as capsaicin, peppermint oil, bitter agents, etc., rodents are kept away from the materials by using the principle of olfactory or taste repellent. Second, toxic substances such as zinc phosphide and strychnine are added to directly poison rodents. Third, by improving the mechanical properties of the material such as hardness, strength, and toughness, the difficulty of rodents to bite is increased. Fourth, by using microcapsule technology, repellents or toxic substances are encapsulated in microcapsules to achieve a slow-release effect and extend the effective period of rodent-proofing.

[0006] However, existing rodent-proof materials still have many shortcomings. For example, the effects of materials based on olfactory or taste repellent are easily affected by environmental factors (such as temperature, humidity, ventilation, etc.), and the volatilization of repellents will shorten the effective period. Although the poison-type rodent-proof materials are effective, they have environmental pollution and safety hazards. The method of simply improving the mechanical properties of materials is often difficult to resist the continuous gnawing of rodents. Although microcapsule technology can extend the effective period, the preparation process is complicated, the cost is high, and there is a problem of premature release of active ingredients due to microcapsule rupture. More importantly, most of the existing studies tend to focus only on a single rodent-proofing mechanism, lacking in-depth research on the synergistic effects of multiple rodent-proofing mechanisms, resulting in less than ideal rodent-proofing effects and limited scope of application. The substances used in the prior art usually have a great impact on the environment and operators.

[0007] Therefore, developing a long-lasting, environmentally friendly, safe, efficient, and multi-functional rodent-proof material is a key technical problem that needs to be solved in the current rodent-proofing technology field. This application aims to solve the above problems of existing rodent-proof materials and provide a new type of rodent-proof material, which not only has excellent rodent-proofing performance, but also takes into account environmental protection, safety, and long-term effectiveness, and can meet the urgent needs of different fields for rodent-proof materials. Summary of the invention

[0008] The purpose of the present invention is to solve the above-mentioned shortcomings and provide a soft PVC material and a preparation method and application thereof.

[0009] In the first aspect, a soft PVC material adopts the following technical solution:

[0010] A soft PVC material, comprising the following components in percentage by mass:

[0011] PVC resin: 40.0%~60.0%;

[0012] Plasticizer: 25.0%~40.0%;

[0013] Alkali-free glass fiber: 5.0%~15.0%;

[0014] Rodent repellent: 1.5% to 5.0%;

[0015] Stabilizer: 2.0%~5.0%;

[0016] Lubricant: 0.5%~1.5%.

[0017] Furthermore, the polymerization degree of the PVC resin is 1000-1300.

[0018] Furthermore, the plasticizer comprises dioctyl phthalate and epoxidized soybean oil, wherein the dioctyl phthalate accounts for 20.0wt% to 30.0wt% of the total mass, and the epoxidized soybean oil accounts for 5.0wt% to 10.0wt% of the total mass.

[0019] Furthermore, the length of the alkali-free glass fiber is 0.5 mm to 2.0 mm.

[0020] Furthermore, the rodent repellent comprises a natural plant extract and an organic tin compound, wherein the natural plant extract accounts for 1.0 wt% to 3.0 wt% of the total mass, and the organic tin compound accounts for 0.5 wt% to 2.0 wt% of the total mass.

[0021] Furthermore, the natural plant extract is selected from peppermint oil, castor oil or a mixture thereof in any proportion.

[0022] Furthermore, the organic tin compound is selected from one or more of dibutyltin dilaurate, dibutyltin dioctoate, and dibutyltin maleate.

[0023] Furthermore, the stabilizer is selected from one or more of zinc stearate, zinc laurate, and calcium stearate;

[0024] The lubricant is selected from one or more of stearic acid, fatty acid ester and amide wax.

[0025] In the second aspect, a method for preparing a soft PVC material adopts the following technical solution:

[0026] A method for preparing a soft PVC material comprises the following steps:

[0027] Mixing PVC resin, plasticizer, rodent repellent, stabilizer and lubricant at 80°C to 100°C for 10 to 15 minutes to obtain a premix;

[0028] The premix is ​​subjected to twin-screw mixing, and the extrusion temperatures of the twin-screw mixing are set from zone 1 to zone 5 to: 160°C to 170°C, 170°C to 180°C, 180°C to 190°C, 190°C to 200°C, and 200°C to 210°C; the screw speed is 200r / min to 300r / min, and the material extrusion residence time is 3min to 5min;

[0029] Glass fiber addition and granulation: between the third and fourth zones of the twin-screw mixing, add the alkali-free glass fiber into the mixed material through side feeding, and continue mixing for 1min to 2min;

[0030] The extruded material is water-cooled and pelletized to obtain soft PVC material particles.

[0031] In a third aspect, an application of a flexible PVC material adopts the following technical solution:

[0032] An application of a flexible PVC material uses the above-mentioned flexible PVC material for rodent-proof protection materials.

[0033] Advantages of this application:

[0034] A flexible PVC material provided by this application has remarkable innovation and practical value in the fields of materials science and rodent-proof technology, and its beneficial effects are reflected in the synergistic effects at multiple levels. From the perspective of the rodent-proof mechanism, this application breaks through the limitations of traditional single rodent-proof means and realizes the organic combination of physical repulsion, chemical deterrence and mechanical barrier. The special smell produced by natural plant extracts can form an invisible olfactory barrier around the PVC material, producing a strong repellent effect on rodents and making them actively stay away from the PVC material. The introduction of organotin compounds endows the PVC material with the ability of chemical deterrence. This compound can not only interact with the molecular chains of PVC resin, improving the thermal stability and anti-aging performance of the PVC material, but more importantly, it is toxic to rodents. Once rodents try to bite, they will have discomfort or even poisoning reactions, thus effectively preventing their further destructive behavior. In addition, the addition of alkali-free glass fiber significantly improves the mechanical properties of the PVC material, especially the tensile strength and tear strength, making the PVC material more tough and difficult to be bitten through or torn by rodents. The synergistic effect of this multiple rodent-proof mechanism enables the PVC material of this application to show excellent and lasting rodent-proof effects in different environments and against different types of rodents, overcoming the defects of single effect and easy failure of traditional rodent-proof materials. From the perspective of the properties of the PVC material, while achieving high-efficiency rodent-proof, this application takes into account the processing performance, mechanical properties, weather resistance and environmental protection safety of the PVC material. By precisely controlling the types and ratios of PVC resin and plasticizer, and the selection of stabilizers and lubricants, the prepared blend material not only maintains the inherent flexibility and easy processability of the PVC resin, but also has significant improvements in tensile strength, tear strength, anti-aging performance, etc. In particular, the application of epoxidized soybean oil (ESO) not only plays a plasticizing role, but also endows the material with better weather resistance and environmental friendliness due to the epoxy groups in its molecular structure. The use of stabilizers avoids the toxicity problems of traditional lead salt stabilizers. The optimization of these properties enables the material of this application to adapt to a wider range of application scenarios and meet the specific requirements of different fields for material properties.

[0035] The preparation method of the soft PVC material provided by this application has the advantages of simple process, easy control, high production efficiency, and controllable cost. By adopting a specific temperature gradient and a twin-screw extrusion mixing process, it ensures that each component is fully dispersed and reacted under the best conditions, thus guaranteeing the uniformity and stability of the material properties. The addition of glass fiber at a specific position not only avoids excessive wear on the screw but also ensures the uniform distribution of glass fiber in the PVC material, maximizing its reinforcing effect. This preparation method not only improves production efficiency and reduces energy consumption but also makes the PVC material of this application easy to realize large-scale industrial production, with good economic and social benefits. Detailed implementation mode

[0036] The following is a further specific description of a soft PVC material, its preparation method, and its application according to the present invention in combination with embodiments. For the sake of simplicity of description, this document cannot enumerate all the alternative technical features and implementation schemes included in the present invention. Therefore, those skilled in the art should be aware that any technical feature and implementation scheme in this embodiment do not limit the protection scope of the present invention, and this protection scope includes any alternative technical features and implementation schemes that those skilled in the art can adopt without creative labor. Specifically, any implementation scheme obtained by replacing any technical feature in the present invention or by combining any two or more technical features provided by the present invention should be within the protection scope of the present invention. For those not specified in the embodiments in terms of specific technologies and conditions, they shall be carried out according to the technologies and conditions described in the literature in this field or according to the product specifications. For reagents or instruments not specified in terms of the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0037] Embodiment

[0038] Embodiment 1

[0039] Embodiment 1 provides a soft PVC material, which includes the following components: PVC resin (degree of polymerization 1000): 50 kg; DOP: 25 kg; ESO: 8 kg; alkali-free glass fiber (length 0.5 mm): 10 kg; peppermint oil: 2 kg; dibutyltin dilaurate: 1 kg; calcium stearate: 3 kg; stearic acid: 1 kg.

[0040] Embodiment 1 provides a preparation method of a soft PVC material, which includes the following steps:

[0041] Premixing: Add the PVC resin, DOP, ESO, peppermint oil, dibutyltin dilaurate, calcium stearate, and stearic acid in the above formula into a high-speed mixer and mix at 80 °C for 15 minutes.

[0042] Mixing: Add the pre-mixed materials into a twin-screw extruder. The temperature settings of the twin-screw extruder are as follows: Zone 1: 160 °C, Zone 2: 170 °C, Zone 3: 180 °C, Zone 4: 190 °C, Zone 5: 200 °C; the screw speed is 200 r / min, and the residence time of the materials in the extruder is 5 minutes.

[0043] Glass fiber addition and pelletizing: Between Zone 3 and Zone 4 of the twin-screw extruder, uniformly add E-glass fiber into the well-mixed materials through a side feeding device, and continue mixing for 2 minutes.

[0044] Extrude the mixed materials through the die head of the extruder, cool them with water, and pelletize them to obtain soft PVC material pellets.

[0045] Example 2

[0046] Example 2 provides a soft PVC material, including the following components: PVC resin (polymerization degree 1200): 45 kg; DOP: 28 kg; ESO: 6 kg; E-glass fiber (length 1 mm): 12 kg; castor oil: 3 kg; dibutyltin dilaurate: 1.5 kg; zinc stearate: 3.5 kg; stearic acid: 1 kg.

[0047] Example 2 provides a preparation method of a soft PVC material, including the following steps:

[0048] Premixing: Add the PVC resin, DOP, ESO, castor oil, dibutyltin dilaurate, zinc stearate, and stearic acid in the above formula into a high-speed mixer, and mix at 90 °C for 12 minutes.

[0049] Mixing: Add the pre-mixed materials into a twin-screw extruder. The temperature settings of the twin-screw extruder are as follows: Zone 1: 165 °C, Zone 2: 175 °C, Zone 3: 185 °C, Zone 4: 195 °C, Zone 5: 205 °C; the screw speed is 250 r / min, and the residence time of the materials in the extruder is 4 minutes.

[0050] Glass fiber addition and pelletizing: Between Zone 3 and Zone 4 of the twin-screw extruder, uniformly add E-glass fiber into the well-mixed materials through a side feeding device, and continue mixing for 1.5 minutes. Then, extrude the mixed materials through the die head of the extruder, cool them with water, and pelletize them to obtain soft PVC material pellets.

[0051] Example 3

[0052] Example 3 provides a flexible PVC material, comprising the following components: PVC resin (degree of polymerization 1300): 40 kg; DOP: 30 kg; ESO: 5 kg; non-alkali glass fiber (length 2 mm): 15 kg; compound of peppermint oil and castor oil (mass ratio 1:1): 3 kg; dibutyltin dilaurate: 2 kg; compound of calcium stearate and zinc stearate (mass ratio 1:1): 4 kg; stearic acid: 1 kg.

[0053] Example 3 provides a method for preparing a flexible PVC material, comprising the following steps:

[0054] Premixing: Add the PVC resin, DOP, ESO, compound of peppermint oil and castor oil, dibutyltin dilaurate, compound of calcium stearate and zinc stearate, and stearic acid in the above formula to a high-speed mixer, and mix at 100 °C for 10 minutes.

[0055] Mixing: Add the premixed materials to a twin-screw extruder. The temperature settings of the twin-screw extruder are: zone 1 170 °C, zone 2 180 °C, zone 3 190 °C, zone 4 200 °C, zone 5 210 °C; the screw speed is 300 r / min, and the residence time of the materials in the extruder is 3 minutes.

[0056] Glass fiber addition and pelletizing: Between zone 3 and zone 4 of the twin-screw extruder, uniformly add non-alkali glass fiber to the mixed materials through a side feeding device, and continue mixing for 1 minute. Then, extrude the mixed materials through the die head of the extruder, cool them with water, and cut them into pellets to obtain flexible PVC material pellets.

[0057] Example 4

[0058] Example 4 provides a flexible PVC material, comprising the following components: PVC resin (degree of polymerization 1300): 40 kg; DOP: 30 kg; ESO: 5 kg; non-alkali glass fiber (length 2 mm): 15 kg; compound of peppermint oil and castor oil (mass ratio 2:1): 3 kg; dibutyltin dioctoate: 2 kg; zinc laurate: 4 kg; fatty acid ester: 1 kg.

[0059] Example 4 provides a method for preparing a flexible PVC material, comprising the following steps:

[0060] Premixing: Add the PVC resin, DOP, ESO, compound of peppermint oil and castor oil, dibutyltin dioctoate, zinc laurate, and fatty acid ester in the above formula to a high-speed mixer, and mix at 100 °C for 10 minutes.

[0061] Mixing: Add the pre-mixed materials into a twin-screw extruder. The temperature settings of the twin-screw extruder are as follows: Zone 1: 170 °C, Zone 2: 180 °C, Zone 3: 190 °C, Zone 4: 200 °C, Zone 5: 210 °C; the screw speed is 300 r / min, and the residence time of the materials in the extruder is 3 minutes.

[0062] Example 5

[0063] Example 5 provides a flexible PVC material, which includes the following components: PVC resin: 40 kg; DOP: 30 kg; ESO: 5 kg; alkali-free glass fiber (length 2 mm): 15 kg; a compound of peppermint oil and castor oil (mass ratio 2:5): 3 kg; dibutyltin maleate: 2 kg; zinc laurate: 4 kg; amide wax: 1 kg.

[0064] Example 5 provides a preparation method of a flexible PVC material, which includes the following steps:

[0065] Pre-mixing: Add the PVC resin, DOP, ESO, the compound of peppermint oil and castor oil, dibutyltin maleate, zinc laurate, and amide wax in the above formula into a high-speed mixer and mix at 100 °C for 10 minutes.

[0066] Mixing: Add the pre-mixed materials into a twin-screw extruder. The temperature settings of the twin-screw extruder are as follows: Zone 1: 170 °C, Zone 2: 180 °C, Zone 3: 190 °C, Zone 4: 200 °C, Zone 5: 210 °C; the screw speed is 300 r / min, and the residence time of the materials in the extruder is 3 minutes.

[0067] Glass fiber addition and pelletizing: Between Zone 3 and Zone 4 of the twin-screw extruder, uniformly add the alkali-free glass fiber into the mixed materials through a side feeding device and continue mixing for 1 minute. Then, extrude the mixed materials through the die head of the extruder, cool them with water, and pelletize them to obtain flexible PVC material pellets.

[0068] Comparative Example

[0069] Comparative Example 1

[0070] The difference between the flexible PVC material provided in Comparative Example 1 and that in Example 3 is that dilauryltin dilaurate is replaced with a compound of peppermint oil and castor oil (mass ratio 1:1) in equal amount. That is, Comparative Example 1 provides a flexible PVC material, which includes the following components: PVC resin (polymerization degree 1300): 40 kg; DOP: 30 kg; ESO: 5 kg; alkali-free glass fiber (length 2 mm): 15 kg; a compound of peppermint oil and castor oil (mass ratio 1:1): 5 kg; a compound of calcium stearate and zinc stearate (mass ratio 1:1): 4 kg; stearic acid: 1 kg.

[0071] The difference between the preparation method of a soft PVC material provided in Comparative Example 1 and that in Example 3 is that dibutyltin dilaurate is not added during premixing.

[0072] Comparative Example 2

[0073] The difference between the soft PVC material provided in Comparative Example 2 and that in Example 3 is that the compound of peppermint oil and castor oil (mass ratio 1:1) is replaced with an equal amount of dibutyltin dilaurate. That is, Comparative Example 2 provides a soft PVC material, including the following components: PVC resin (degree of polymerization 1300): 40 kg; DOP: 30 kg; ESO: 5 kg; alkali-free glass fiber (length 2 mm): 15 kg; dibutyltin dilaurate: 5 kg; compound of calcium stearate and zinc stearate (mass ratio 1:1): 4 kg; stearic acid: 1 kg.

[0074] The difference between the preparation method of a soft PVC material provided in Comparative Example 2 and that in Example 3 is that the compound of peppermint oil and castor oil (mass ratio 1:1) is not added during premixing.

[0075] Comparative Example 3

[0076] The difference between the soft PVC material provided in Comparative Example 3 and that in Example 3 is that the alkali-free glass fiber (length 2 mm) is replaced with an equal amount of PVC resin (degree of polymerization 1300). That is, Comparative Example 3 provides a soft PVC material, including the following components: PVC resin (degree of polymerization 1300): 55 kg; DOP: 30 kg; ESO: 5 kg; compound of peppermint oil and castor oil (mass ratio 1:1): 3 kg; dibutyltin dilaurate: 2 kg; compound of calcium stearate and zinc stearate (mass ratio 1:1): 4 kg; stearic acid: 1 kg.

[0077] The preparation method of the soft PVC material provided in Comparative Example 3 includes the following steps:

[0078] Premixing: Add the PVC resin, DOP, ESO, compound of peppermint oil and castor oil, dibutyltin dilaurate, compound of calcium stearate and zinc stearate, and stearic acid in the above formula into a high-speed mixer, and mix at 100 °C for 10 minutes.

[0079] Mixing and kneading: Add the premixed materials into a twin-screw extruder. The temperature of the twin-screw extruder is set as follows: zone 1 170 °C, zone 2 180 °C, zone 3 190 °C, zone 4 200 °C, zone 5 210 °C; the screw speed is 300 r / min, and the residence time of the materials in the extruder is 3 minutes. Then, extrude the mixed materials through the die head of the extruder, cool them with water, and pelletize them to obtain soft PVC material pellets.

[0080] Comparative Example 4

[0081] Comparative Example 4 provides a flexible PVC material, which is different from that of Example 3 in that the length of the E-glass fiber is 3 mm.

[0082] The preparation method of the flexible PVC material provided in Comparative Example 4 is the same as that of Example 3.

[0083] Comparative Example 5

[0084] Comparative Example 5 provides a flexible PVC material, which is different from that of Example 3 in that the length of the E-glass fiber is 0.3 mm.

[0085] The preparation method of the flexible PVC material provided in Comparative Example 5 is the same as that of Example 3.

[0086] Comparative Example 6

[0087] Comparative Example 6 provides a flexible PVC material which is the same as that of Example 3.

[0088] The preparation method of the flexible PVC material provided in Comparative Example 6 is different from that of Example 3 in that the E-glass fiber is added in the premixing stage. That is, the preparation method of the flexible PVC material provided in Comparative Example 6 includes the following steps:

[0089] Premixing: Add the PVC resin, DOP, ESO, the compound of peppermint oil and castor oil, E-glass fiber, dibutyltin dilaurate, the compound of calcium stearate and zinc stearate, and stearic acid in the above formula into a high-speed mixer and mix at 100 °C for 10 minutes.

[0090] Mixing and kneading: Add the premixed material into a twin-screw extruder. The temperature of the twin-screw extruder is set as follows: Zone 1: 170 °C, Zone 2: 180 °C, Zone 3: 190 °C, Zone 4: 200 °C, Zone 5: 210 °C; the screw speed is 300 r / min, and the residence time of the material in the extruder is 3 minutes. Then, extrude the mixed material through the die head of the extruder, cool it with water and pelletize it to obtain flexible PVC material particles.

[0091] Performance testing

[0092] Tensile strength test: According to the standard of GB / T 1040.2-2006, inject the flexible PVC material particles prepared in Examples 1-5 and Comparative Examples 1-6 into standard specimens, and use a universal material testing machine to conduct tensile strength tests.

[0093] Tear resistance test: Conduct tear resistance tests on the standard specimens according to the standard of GB / T 529-2008.

[0094] Anti-rat effect test: The actual rat gnawing effect was detected by using the standards of GB / T34016-2017 and JB / T10696.10-2011. The prepared material samples were placed in the rat activity area, and video monitoring and regular inspections were carried out during the 15-day observation period.

[0095] The test results of the tensile strength, tear strength and anti-rat effect during the 15-day observation period of the same standard splines prepared from the soft PVC materials provided in Examples 1-5 and Comparative Examples 1-6 are shown in Table 1 below.

[0096] Table 1 Performance test of standard splines of soft PVC materials provided in Examples 1-5 and Comparative Examples 1-6

[0097]

[0098]

[0099] It can be seen from the data in Table 1 that the mechanical strength, weather resistance and anti-rat performance of the soft PVC material have been successfully improved through the reasonable proportioning of PVC resin, plasticizer, non-alkali glass fiber, anti-rat agent, stabilizer and lubricant. Specifically, the tensile strength of Examples 1 to 5 is between 19.5 MPa and 23.2 MPa, the tear strength ranges from 28.8 KN / m to 35.1 KN / m, and excellent effects of no obvious gnawing marks are shown in the 15-day anti-rat test. The anti-rat performance evaluation reaches 0.9, which is significantly better than the materials of each comparative example.

[0100] Among them, the degree of polymerization (1000-1300) of PVC resin plays an important role in the basic mechanical properties of the material, and the compounding of plasticizers (DOP and epoxidized soybean oil) takes into account the flexibility and weather resistance of the material. The addition of non-alkali glass fiber significantly improves the mechanical strength of the material, especially in terms of tear resistance. The tear strength of Example 3 (non-alkali glass fiber length 2 mm) reaches the highest value of 35.1 KN / m. In addition, the role of the anti-rat agent cannot be ignored. The synergistic effect of peppermint oil, castor oil and organotin compounds used in the examples not only produces a repellent effect in terms of smell, but also causes discomfort during the gnawing process, thus effectively reducing the gnawing behavior.

[0101] In contrast, the performance of the materials in the comparative examples is reduced due to the adjustment of the components. Comparative Examples 1 and 2 use peppermint oil and castor oil compound and dibutyltin dilaurate as single replacements for the rodent-proof components, respectively. Although the mechanical properties do not change much, the rodent-proof effect is significantly reduced, and the evaluations are 0.5 and 0.4, respectively, indicating that a single rodent-proof mechanism is difficult to achieve the expected effect. Comparative Example 3 completely removes the alkali-free glass fiber. The results show that the tensile strength drops to 13.3MPa, the tear strength is only 23KN / m, and the biting phenomenon occurs in the rat bite experiment, and the rodent-proof evaluation is only 0.3. In addition, Comparative Examples 4 and 5 adjust the length of the alkali-free glass fiber to 3mm and 0.3mm. Although the tensile strength is slightly improved or remains the same, the tear strength is lower than that of the embodiment, and the rodent-proof effect is reduced. Comparative Example 6 changes the way of adding glass fiber, adding glass fiber in the premixing stage, resulting in weakened dispersibility and reinforcement effect, and ultimately showing the lowest mechanical strength (tensile strength 12.1 MPa, tear strength 22.2 KN / m), and obvious biting in the rat bite test, with a rat resistance rating of only 0.3.

[0102] In summary, the soft PVC material provided by the present application realizes the coordinated optimization of multiple rodent-proofing mechanisms in structural design, which not only improves the mechanical properties of the material, but also ensures a long-term and stable rodent-proofing effect. Its preparation method accurately controls the temperature gradient through a twin-screw mixing process, so that each component is fully mixed, improves the uniformity and stability of the material, and has the advantage of being industrially produced. Therefore, the material has broad application prospects in the fields of cable sheaths, warehousing and logistics, and building components, can effectively deal with rodent problems, and improve the safety and durability of equipment and facilities.

[0103] For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from them are still within the scope of protection of the claims of the invention.

Claims

1. A soft PVC material, characterized in that, The PVC material includes the following components in percentage by mass: PVC resin: 40.0%~60.0%; Plasticizer: 25.0%~40.0%; Alkali-free glass fiber: 5.0%~15.0%; Rodent repellent: 1.5% to 5.0%; Stabilizer: 2.0%~5.0%; Lubricant: 0.5%~1.5%.

2. The soft PVC material according to claim 1, wherein The polymerization degree of the PVC resin is 1000-1300.

3. The soft PVC material according to claim 1, characterized in that The plasticizer comprises dioctyl phthalate and epoxidized soybean oil, wherein the dioctyl phthalate accounts for 20.0wt% to 30.0wt% of the total mass, and the epoxidized soybean oil accounts for 5.0wt% to 10.0wt% of the total mass.

4. A soft PVC material according to claim 1, wherein, The length of the alkali-free glass fiber is 0.5 mm to 2.0 mm.

5. The soft PVC material according to claim 1, wherein The rodent repellent comprises natural plant extracts and organic tin compounds, wherein the natural plant extracts account for 1.0 wt% to 3.0 wt% of the total mass, and the organic tin compounds account for 0.5 wt% to 2.0 wt% of the total mass.

6. The soft PVC material according to claim 5, characterized in that, The natural plant extract is selected from peppermint oil, castor oil or a mixture thereof in any proportion.

7. The soft PVC material according to claim 5, characterized in that, The organic tin compound is selected from one or more of dibutyltin dilaurate, dibutyltin dioctoate and dibutyltin maleate.

8. The soft PVC material according to claim 1, wherein, The stabilizer is selected from one or more of zinc stearate, zinc laurate and calcium stearate; The lubricant is selected from one or more of stearic acid, fatty acid ester and amide wax.

9. A preparation method of a soft PVC material, characterized in that, The process includes: Mixing PVC resin, plasticizer, rodent repellent, stabilizer and lubricant at 80°C to 100°C for 10 to 15 minutes to obtain a premix; The premix is ​​subjected to twin-screw mixing, and the extrusion temperatures of the twin-screw mixing are set from zone 1 to zone 5 to: 160°C to 170°C, 170°C to 180°C, 180°C to 190°C, 190°C to 200°C, and 200°C to 210°C; the screw speed is 200r / min to 300r / min, and the material extrusion residence time is 3min to 5min; Glass fiber addition and granulation: between the third and fourth zones of the twin-screw mixing, add the alkali-free glass fiber into the mixed material through side feeding, and continue mixing for 1min to 2min; The extruded material is water-cooled and pelletized to obtain soft PVC material particles.

10. Application of a soft PVC material, characterized in that, The soft PVC material according to any one of claims 1 to 8 is used as a rodent-proof protective material.

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